Using the MaTeX package from our colleague Szabolcs I had a certain problem. I would like to highlight the result for bold, but I did not get a result that I liked. I tried several options that I found: \boldmath, \bm, \mathbf and \textbf. What came closest was \mathbf, but Pi did not get bold. Is that so?

Needs["MaTeX`"]
MaTeX["\\int_0^r 2\\pi r\\,dr = 2\\pi \\int_0^r r\\,dr = \
2\\pi\\bigg\vert_0^r \\frac{r^2}{2} = \\bigg(2\\pi \
\\frac{r^2}{2}\\bigg)-\\bigg(2\\pi \\frac{0^2}{2}\\bigg) = \
\\frac{2\\pi r^2}{2} = \\mathbf{\\pi r^2}"]

Using the MaTeX package from our colleague Szabolcs I had a certain problem. I would like to highlight the result for bold, but I did not get a result that I liked. I tried several options that I found: \boldmath, \bm, \mathbf and \textbf. What came closest was \mathbf, but Pi did not get bold. Is that so?

Needs["MaTeX`"]
MaTeX["\\int_0^r 2\\pi r\\,dr = 2\\pi \\int_0^r r\\,dr = \
2\\pi\\bigg\vert_0^r \\frac{r^2}{2} = \\bigg(2\\pi \
\\frac{r^2}{2}\\bigg)-\\bigg(2\\pi \\frac{0^2}{2}\\bigg) = \
\\frac{2\\pi r^2}{2} = \\mathbf{\\pi r^2}"]